Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea87a8bc2bfb83d6…

MALICIOUS

PDF

93.3 KB Created: 2021-09-04 09:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f34b38831716a3d03db9c0677548b57e SHA-1: 65d4d48d0c6a956d0688196499b63244e81a776b SHA-256: ea87a8bc2bfb83d600fb1d1c096ad569c7a483b3cb514140ea4d920189d878b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2d5f84807---ganelareno.pdf In PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2ee79cbd32972bd9d087d6bcd3c48d87/25208218645.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/vasukididiteroduw.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/cf1367a216be5dd6b40d592a242154ea/mibuwujoxowavuke.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/47f3a48cbab742484296e4c69d0e1b8f/parelu.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e31acfaf5---dilijaretozuzuzok.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/tisadexide.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9a0b4b077---23180313864.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/82211309477.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/79857217186.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3fd6be8e8---41918285393.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/puwajezogawuzojozisoxabit.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/27100998671.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/b83f3d03ce79efd497a79e9ddead2561/rujor.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/sqq4a9scsqf0u1v05t9ce36bvi/33563905755.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/644752574db4ed2b3496956b88a93720/55075052779.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/22827033829.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4d9175303---85858306992.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/72441810178.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/5186532710.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d66e5a9dbf---28345654943.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/24214710320.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/49695541239.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/pc4v31f249olv62jae195r6shj/76130912110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=contracts+rights+of+third+parties+act+1999+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED6 11104 bytes
SHA-256: 835519dd8b50a94464df819de0b736d5bd189a9af6aff7b03f310436cb0c15b3
font_02_sfnt_off00013894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13894 18200 bytes
SHA-256: 41c12c6455bbc71a9c6465705c92fcc95b296f0691053b0dfad18c71099c4cb4

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